[PATCH v5] clk: add MOXA ART SoCs clock driver

This patch adds MOXA ART SoCs clock driver support.

Signed-off-by: Jonas Jensen <redacted>
---

Notes:
    Changes since v4:
    
    1. remove unnecessary header includes
    
    Applies to next-20130716

 .../bindings/clock/moxa,moxart-core-clock.txt      | 23 ++++++++
 drivers/clk/Makefile                               |  1 +
 drivers/clk/clk-moxart.c                           | 69 ++++++++++++++++++++++
 3 files changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt
 create mode 100644 drivers/clk/clk-moxart.c

diff --git a/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt b/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt
new file mode 100644
index 0000000..528c8b0
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt

@@ -0,0 +1,23 @@
+Device Tree Clock bindings for arch-moxart
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+MOXA ART SoCs allow to determine core clock frequencies by reading
+a register.
+
+Required properties:
+- compatible : Should be "moxa,moxart-core-clock"
+- #clock-cells : Should be 0
+- reg : Should contain registers location and length
+- clock-output-names : Should be "coreclk"
+
+For example:
+
+	coreclk: core-clock at 98100000 {
+		compatible = "moxa,moxart-core-clock";
+		#clock-cells = <0>;
+		reg = <0x98100000 0x34>;
+		clock-output-names = "coreclk";
+	};

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 4038c2b..933622f 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile

@@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK)	+= clk-composite.o
 
 # SoCs specific
 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
+obj-$(CONFIG_ARCH_MOXART)	+= clk-moxart.o
 obj-$(CONFIG_ARCH_NOMADIK)	+= clk-nomadik.o
 obj-$(CONFIG_ARCH_HIGHBANK)	+= clk-highbank.o
 obj-$(CONFIG_ARCH_NSPIRE)	+= clk-nspire.o

diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c
new file mode 100644
index 0000000..5559371
--- /dev/null
+++ b/drivers/clk/clk-moxart.c

@@ -0,0 +1,69 @@
+/*
+ * MOXA ART SoCs clock driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/clkdev.h>
+
+void __init moxart_of_clk_init(struct device_node *node)
+{
+	static void __iomem *base;
+	struct clk *clk;
+	unsigned long rate;
+	unsigned int mul, val, div;
+	const char *name;
+
+	base = of_iomap(node, 0);
+	if (IS_ERR(base))
+		panic("%s: of_iomap failed\n", node->full_name);